Mate Translate allows you to translate words and phrases between over 100 languages, use text-to-speech, and browse through already-done translations in the history. You can quickly swap languages in the pop-up using Control+S.

Features
• 100+ languages supported
• text-to-speech
• offline history of translations
• translate in the pop-up window that’s always in the menu bar
• translate selected text from the context menu
• open the pop-up with a shortcut
• autorun as the Mac starts
• pin the pop-up window above all other windows
• transliteration
• insert contents of the clipboard